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Amino wet combined desulfurization and denitration device and process

A technology of desulfurization, denitrification and wet method, which is applied in the direction of separation method, ammonium sulfate, chemical equipment and methods, etc. It can solve the problems of large fluctuation range of pH value, inability to take into account desulfurization efficiency, unstable desulfurization efficiency, etc., to improve the purity , Improve desulfurization efficiency and ammonium sulfate crystal quality, save operating costs and investment costs

Inactive Publication Date: 2012-12-19
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In this system, the pH value is difficult to control and cannot take into account both the desulfurization efficiency of flue gas and the oxidation crystallization efficiency of ammonium sulfite. At the same time, the ammonia supply in the desulfurization tower in this system is based on the content of sulfur dioxide in the flue gas, while the amount of ammonia in the flue gas The sulfur dioxide content fluctuates in a large range and is difficult to control. If it is not properly controlled, the pH value of the entire slurry system will fluctuate in a large range, resulting in a large amount of aerosols and unstable desulfurization efficiency.

Method used

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  • Amino wet combined desulfurization and denitration device and process

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Embodiment 1

[0053] In a thermal power plant, three 130t / h boilers adopt this desulfurization and denitrification process, and the liquid-gas ratio of the desulfurization tower is 8L / m 3 , the pH value of the desulfurization tower is controlled at 5.9-6.0, the pH value of the oxidation tank is controlled at 5.6-6.0, the ozone supply is 1:1, the perforated plate is located 0.6m above the oxidation duct; the inlet SO 2 The concentration is 6324mg / m 3 , NO concentration is 273mg / m 3 , the flue gas temperature is 142°C, the outlet SO 2 The concentration is 38mg / m 3 , NO concentration is 13mg / m 3 , the purity of ammonium sulfate is 96.9%, and the crystal particle size range of ammonium sulfate is 1mm-3mm.

Embodiment 2

[0055] A self-provided power plant, one 335WM unit adopts this desulfurization and denitrification process, the liquid-gas ratio of the desulfurization tower is 8, the pH value of the desulfurization tower is controlled at 5.9-6.2, the pH value of the oxidation tank is controlled at 5.8-6.0, and the ozone supply is 1: 1. The porous plate is located 0.5m above the oxidation air duct; the inlet SO 2 The concentration is 5428mg / m 3 , NO concentration is 413mg / m 3 , the flue gas temperature is 139°C, the outlet SO 2 Concentration is 27mg / m3, NO concentration is 17mg / m 3 , the purity of ammonium sulfate is 97.3%, and the crystal particle size range of ammonium sulfate is 1mm-3mm.

Embodiment 3

[0057] In a power plant, five 75t / h boilers adopt this desulfurization and denitrification process. The liquid-gas ratio of the desulfurization tower is 7, the pH value of the desulfurization tower is controlled at 5.9-6.1, the pH value of the oxidation tank is controlled at 5.6-5.8, and the ozone supply is 1: 1. The perforated plate is located 0.7m above the oxidation air duct; the inlet SO 2 The concentration is 3861mg / m 3 , NO concentration is 477mg / m 3 , the flue gas temperature is 137°C, the outlet SO 2 The concentration is 18mg / m3, the NO concentration is 21mg / m 3 , the purity of ammonium sulfate is 96.1%, and the crystal particle size range of ammonium sulfate is 1mm-3mm.

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Abstract

The invention discloses amino wet combined desulfurization and denitration device and a process. The device comprises a desulfurization tower with an inlet flue, a liquid ammonia storage tank, an ozone generator, and a booster fan on the inlet flue; and a defogging layer, a spraying layer and a tower kettle are orderly arranged inside the desulfurization tower from top to bottom. The device also comprises an oxidization slot communicated with the tower kettle, and an oxidization fan connected to the oxidization slot; the liquid ammonia storage tank is communicated to the tower kettle through one path of pipeline, and is communicated to the bottom part of the oxidization slot through another pipeline; the ozone generator is communicated to an air inlet of the booster fan through the pipeline; ozone is sprayed into smoke from the air inlet of the booster fan; nitric oxide in the smoke is oxidized into nitrogen dioxide; the smoke oxidized by ozone is conveyed to the desulfurization tower; liquid ammonia is sprayed to desulfurize and denitrate; the smoke is discharged after being defogged and dried; and circulating liquid by which sulfur dioxide and nitrogen dioxide are absorbed is oxidized outside the tower, and the liquid ammonia is conveyed to the oxidization slot to adjust the pH (Potential Of Hydrogen) value in the oxidization slot during the oxidization process.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to an amino wet method combined desulfurization and denitrification device and process, aimed at the removal of sulfur dioxide and nitrogen oxides in the flue gas of coal-fired boilers and the recovery and utilization of by-products. Background technique [0002] Ammonia desulfurization technology uses liquid ammonia, ammonia water or urea to remove SO in flue gas 2 , while generating high-quality ammonium sulfate (NH 4 ) 2 SO 4 . Ammonia desulfurization technology is especially suitable for large-scale thermal power generation units and chemical companies burning cheap high-sulfur fuel tail gas SO 2 Removal, while using waste ammonia for desulfurization, produces high-quality, high-purity ammonium sulfate, which has gradually become the mainstream technology for comprehensive utilization of circular economy in large-scale flue gas desulfurization projects. [000...

Claims

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Application Information

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IPC IPC(8): B01D53/60B01D53/76B01D53/78B01D53/96C01C1/24
Inventor 李泽清莫建松程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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